writing engineering formulas and putting simple shapes or graphs on the site

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writing engineering formulas and putting simple shapes or graphs on the site

hello
i will make a section of a website which needs to explain some engineering subjects in detail, which will involve some simple shapes, graphs, and also a lot of formulas which involve lots of strange greek signs and square root sings, etc...

how can i most efficiently and quickly write them? what should i use? for instance i thought about using the figures in ms word but that is extremely inefficient.